CN214970392U - Low-residue rubber piston for pre-filling and sealing syringe - Google Patents
Low-residue rubber piston for pre-filling and sealing syringe Download PDFInfo
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- CN214970392U CN214970392U CN202120289278.0U CN202120289278U CN214970392U CN 214970392 U CN214970392 U CN 214970392U CN 202120289278 U CN202120289278 U CN 202120289278U CN 214970392 U CN214970392 U CN 214970392U
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- included angle
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- injector
- conical surface
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Abstract
The utility model discloses a low-residue rubber piston for a pre-filling and sealing injector, which comprises a piston body, wherein the piston body mainly comprises an umbrella-shaped plug head and a hollow cylindrical plug body inside, and the included angle of the top end of the umbrella-shaped plug head is 5-35 degrees larger than the included angle of the conical surface at the front end of the injector; the periphery of the round plunger body is provided with at least one annular sealing ring, and the inside of the round plunger body is provided with a threaded cavity connected with the push rod. The utility model has reasonable design, simple structure, small residual quantity after injection and accurate injection quantity; the purpose of reducing the residual quantity of the liquid medicine is achieved by controlling the included angle relation between the umbrella-shaped plug head of the piston and the front end conical surface of the injector, the operation is simple, the practical application effect is good, a matched low-residual piston structure can be rapidly designed aiming at various injectors with different included angles of the front end conical surface, and the waste of the liquid medicine is reduced.
Description
Technical Field
The utility model belongs to the medicine packing field, concretely relates to low rubber piston for embedment syringe in advance that remains.
Background
The pre-filled syringe is used as an advanced medicine packaging form, has wider and wider application range, has two functions of packaging and storing medicines and medicine injection, is mainly applied to packaging of biological medicines, gene medicines and immune medicines with higher added values and packaging of household medicines for treating chronic diseases, and is convenient for patients to inject by themselves.
In the prior art, due to the fact that the design of the matched piston is not reasonable enough, a large amount of liquid medicine still remains in the injection tube after the injection of the injector is completed, resource waste is caused, the actual injection amount is lower than the theoretical injection amount, and injection errors are generated. Therefore, two piston structures with flat tops and conical surfaces at the tops appear on the market, and are respectively applied to the syringes with the flat tops and the conical surfaces at the tops, so that the purpose of reducing the medicine liquid residue is achieved. However, at present, the included angles of the conical surfaces at the front ends of injectors of different manufacturers and different specifications are different, and even if the top of the piston is designed into the conical surface, if the included angle of the conical surface is not proper, the residual capacity can exceed the standard; in addition, in order to ensure the sealing performance, the diameter of the piston is usually larger than the inner diameter of the syringe, the piston is extruded and deformed in the syringe, and the residual capacity still exceeds the standard under the condition that the included angle of the conical surface at the top end of the piston is completely the same as that of the conical surface at the front end of the injector, so that the injection precision is reduced and the liquid medicine is wasted.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a low rubber piston for embedment syringe in advance that remains of low, the leakproofness good, simple structure, easily design and processing of the volume of remaining to not enough in the background art.
Realize the technical scheme of the utility model is that:
the rubber piston for the low-residue pre-filling and sealing syringe comprises a piston body, wherein the piston body mainly comprises an umbrella-shaped plug head and a hollow cylindrical plug body, at least one annular sealing ring is arranged on the periphery of the cylindrical plug body, a threaded cavity connected with a push rod is arranged in the cylindrical plug body, and the included angle a of the top end of the umbrella-shaped plug head is 5-35 degrees larger than the included angle b of the conical surface at the front end of the syringe.
Furthermore, the included angle a of the top end of the umbrella-shaped plug head is 10-30 degrees larger than the included angle b of the conical surface at the front end of the injector.
Furthermore, the included angle a of the top end of the umbrella-shaped plug head is 8-20 degrees larger than the included angle b of the conical surface at the front end of the injector.
Furthermore, the top end of the umbrella-shaped plug head is provided with a residue discharge column head, and when the piston is pushed to the foremost end of the injector, the residue discharge column head enters the injection nozzle of the injector to discharge the residual liquid medicine in the injection nozzle of the injector.
Furthermore, the diameter of the annular sealing ring is 0.2-0.6mm larger than the inner diameter of the syringe.
The utility model has the advantages that: the design is reasonable, the structure is simple, the residual quantity after injection is small, and the injection quantity is accurate; the purpose of reducing the residual quantity of the liquid medicine is achieved by controlling the included angle relation between the umbrella-shaped plug head of the piston and the front end conical surface of the injector, the operation is simple, the practical application effect is good, a matched low-residual piston structure can be rapidly designed aiming at various injectors with different included angles of the front end conical surface, and the waste of the liquid medicine is reduced.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 and embodiment 2 of the present invention.
Fig. 2 is a schematic structural view of embodiment 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, the low-residue rubber piston for the pre-filling and sealing syringe comprises a piston body, wherein the piston body mainly comprises an umbrella-shaped plug head 2 and a cylindrical plug body 1 with a hollow inner part, at least one annular sealing ring 3 is arranged on the periphery of the cylindrical plug body 1, and a threaded cavity 4 connected with a push rod is arranged in the cylindrical plug body. When the piston umbrella-shaped plug head is matched with the injector in use, the sealing ring is in extrusion contact with the inner wall of the injector to ensure good sealing performance, an area enclosed by the piston umbrella-shaped plug head, the front end of the injector and the side wall is a liquid storage area, the injector push rod is pushed, the piston moves forwards to push out liquid medicine until the piston umbrella-shaped plug head is completely attached to the conical surface of the front end of the injector, and injection is completed. For the rubber piston for the pre-filling and sealing syringe with nominal capacity less than 5ml, the included angle a of the top end of the umbrella-shaped plug head is 10-30 degrees larger than the included angle b of the conical surface at the front end of the syringe, and the residual quantity is qualified. The residual amount test results were as follows:
example 2
As shown in fig. 1, the low-residue rubber piston for the pre-filling and sealing syringe comprises a piston body, wherein the piston body mainly comprises an umbrella-shaped plug head 2 and a cylindrical plug body 1 with a hollow inner part, at least one annular sealing ring 3 is arranged on the periphery of the cylindrical plug body 1, and a threaded cavity 4 connected with a push rod is arranged in the cylindrical plug body. When the piston umbrella-shaped plug head is matched with the injector in use, the sealing ring is in extrusion contact with the inner wall of the injector to ensure good sealing performance, an area enclosed by the piston umbrella-shaped plug head, the front end of the injector and the side wall is a liquid storage area, the injector push rod is pushed, the piston moves forwards to push out liquid medicine until the piston umbrella-shaped plug head is completely attached to the conical surface of the front end of the injector, and injection is completed. For the rubber piston for the pre-filling and sealing syringe with the nominal capacity of 5ml or more than 5ml, the included angle a of the top end of the umbrella-shaped plug head is 8-20 degrees larger than the included angle b of the conical surface at the front end of the syringe, and the residual quantity is qualified. The residual amount test results were as follows:
example 3
As shown in figure 2, the top end of the umbrella-shaped plug is also provided with a residue discharge column head 5, when the piston is pushed to the forefront end of the syringe, the residue discharge column head 5 enters the interior of the injection nozzle of the syringe to discharge the residual liquid medicine in the injection nozzle of the syringe, and the residual quantity is further reduced. The rest of the structure is the same as that of embodiment 1 and embodiment 2. On the basis of example 2, a residue removing column cap with the diameter of 2mm and the length of 3mm is added on the top of the umbrella-shaped plug head of the rubber piston with the included angle a of 128 degrees at the top end, and a pre-filled syringe with the nominal capacity of 5ml and the included angle b of a conical surface of 120 degrees is selected for carrying out residue amount test, and the result is as follows:
the above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a low rubber piston for embedment syringe in advance that remains, includes the piston body, the piston body includes umbelliform chock plug (2) and inside hollow round plunger body (1), round plunger body (1) inside is equipped with screw cavity (4) be connected with the push rod, its characterized in that: the periphery of the round plunger body (1) is provided with at least one annular sealing ring (3), and the included angle a of the top end of the umbrella-shaped plug head is 5-35 degrees larger than the included angle b of the conical surface at the front end of the injector.
2. The rubber piston for the low-residue pre-potting syringe according to claim 1, wherein: the included angle a of the top end of the umbrella-shaped plug head (2) is 10-30 degrees larger than the included angle b of the conical surface of the front end of the injector.
3. The rubber piston for the low-residue pre-potting syringe according to claim 1, wherein: the included angle a of the top end of the umbrella-shaped plug head (2) is 8-20 degrees larger than the included angle b of the conical surface of the front end of the injector.
4. The rubber piston for the low-residue pre-potting syringe according to claim 2 or 3, wherein: the top end of the umbrella-shaped plug head (2) is provided with a residue removing column head (5).
5. The rubber piston for the low-residue pre-potting syringe according to claim 4, wherein: the diameter of the annular sealing ring (3) is 0.2-0.6mm larger than the inner diameter of the syringe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120289278.0U CN214970392U (en) | 2021-02-02 | 2021-02-02 | Low-residue rubber piston for pre-filling and sealing syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120289278.0U CN214970392U (en) | 2021-02-02 | 2021-02-02 | Low-residue rubber piston for pre-filling and sealing syringe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214970392U true CN214970392U (en) | 2021-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120289278.0U Active CN214970392U (en) | 2021-02-02 | 2021-02-02 | Low-residue rubber piston for pre-filling and sealing syringe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214970392U (en) |
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2021
- 2021-02-02 CN CN202120289278.0U patent/CN214970392U/en active Active
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